The header <string.h> has a strcpy macro that expands strcpy(x,y) to
__strcpy(x,y), and the latter is then used by the compiler to generate
inline code for strcpy. Because of the macro, your extern declaration
contains an invalid macro expansion. The real cure is to remove your
extern declaration but adding -U__STR__ to your xlc will also do the
trick, although your program might run a bit more slowly as the compiler
cannot inline the string functions any more.

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